Greater Vancouver’s climate is deceptively demanding on HVAC systems. Mild but persistently wet winters push heating systems hard from October through April, while increasingly hot summers are turning AC from a luxury into a necessity. A well-maintained system runs efficiently, lasts years longer, and — most importantly — won’t leave you without heat on a cold January night.
This checklist covers everything Greater Vancouver homeowners should do each season to keep their HVAC running at peak performance.
Spring Checklist (March – May)
Spring is the ideal time to service your cooling system before the summer heat arrives — and technicians are far less booked than in July.
- Replace furnace filter — do this every 1–3 months depending on filter type and household (more often with pets)
- Clean AC condenser coils — gently rinse outdoor unit fins with a garden hose to remove winter debris
- Check refrigerant lines — look for ice buildup or oily stains that indicate a refrigerant leak
- Test AC operation — run the system on a warm day before you actually need it; better to find problems now
- Clear condensate drain lines — pour a cup of diluted bleach into the drain pan to prevent algae blockages
- Inspect ductwork for leaks — seal any gaps with mastic sealant or metal tape (not standard duct tape)
Summer Checklist (June – August)
- Check and change filters monthly during heavy-use periods — a clogged filter is the #1 cause of AC breakdowns
- Keep outdoor unit clear — maintain at least 2 feet of clearance around the condenser; trim back shrubs and remove debris after windstorms
- Monitor thermostat performance — if the system is short-cycling (turning on and off rapidly), call a technician
- Check vents and registers — ensure all supply and return vents are open and unobstructed by furniture
- Inspect insulation on refrigerant lines — replace any deteriorated foam insulation on the suction line running into your home
Fall Checklist (September – November)
Fall is the most important season for HVAC maintenance in BC. This is when you transition from cooling to heating — and when you want to be certain your furnace or boiler is ready for the months ahead.
- Schedule a professional furnace tune-up — a certified technician will inspect the heat exchanger, clean the burners, test ignition, check gas pressure, and verify safety controls
- Test carbon monoxide and smoke detectors — replace batteries and test function before heating season starts
- Inspect and clean the flue pipe — ensure there are no blockages, corrosion, or separations in the exhaust venting
- Check pilot light and ignition — on older gas furnaces, ensure the pilot lights reliably; on newer models, test the electronic ignition
- Bleed radiators (for hot water/boiler systems) — release trapped air to restore heating efficiency to all radiators
- Seal drafts around windows and doors — reducing infiltration cuts heating costs and reduces system load
- Replace thermostat batteries — the last thing you want is a dead thermostat battery at midnight in January
Winter Checklist (December – February)
- Check filter monthly — heating season means high run-time; check and change filters regularly
- Keep outdoor heat pump components clear of snow and ice — never cover a heat pump; it needs airflow to operate
- Monitor system performance — unusual sounds (banging, screeching, rumbling) are early warning signs of mechanical failure
- Know your emergency shutoff — locate the gas shutoff valve and electrical disconnect for your furnace before you need them in a crisis
- Keep interior temperatures above 13°C even if you’re away — this protects pipes and keeps the system from working too hard on return
Year-Round Tips
- Keep a log of filter changes, service dates, and any unusual events — this helps technicians diagnose issues faster
- Upgrade to a smart thermostat (Ecobee, Nest, or similar) — setback scheduling alone can reduce heating costs by 10–15%
- Consider an annual maintenance agreement — our Main Drain Mechanical service plan covers one spring and one fall inspection at a preferred rate
When to Call a Professional
Some HVAC maintenance is DIY-friendly — filter changes, keeping the area around the unit clear, testing detectors. But the following always require a licensed technician:
- Any work involving gas lines or gas appliances
- Refrigerant charging or handling (requires a refrigerant handling certificate in BC)
- Heat exchanger inspection — a cracked heat exchanger can leak carbon monoxide, which is deadly and invisible
- Electrical repairs to the unit or control board
- Any time the system makes a new noise, trips a breaker, or fails to heat or cool adequately
Book Your Annual HVAC Service Today
Main Drain Mechanical’s Red Seal certified technicians service all major furnace, boiler, and heat pump brands across Greater Vancouver. We carry parts on the truck for most common repairs, which means same-visit fixes in most cases — not a return trip that leaves you waiting.
Call (778) 900-2017 to book your seasonal tune-up, or request a service appointment online. We serve Vancouver, Burnaby, Richmond, Surrey, Delta, New Westminster, Coquitlam, and North Shore.